<template>
   <div class="todo-footer" v-show="total">
        <label>
          <input type="checkbox" v-model="isAll"/>
        </label>
        <span>
          <span>已完成{{doneTotal}}</span> / 全部{{total}}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
      </div>
</template>

<script>
export default {
   name:'MyFooter',
   props:['todos'],
   computed:{
     total(){
        return this.todos.length
     },
     doneTotal(){
       return this.todos.reduce((pre,todo) => pre + (todo.done ? 1 : 0),0)
     },
     isAll:{
       get(){
          return this.doneTotal === this.total && this.total > 0
       },
       set(value){
            //this.checkAllTodo(value)
            this.$emit('checkAllTodo',value)
       }
     }
   },
   methods: {
    //  checkAll(e){
    //    this.checkAllTodo(e.target.checked)
    //  }
    clearAll(){
      // this.clearAllTodo()
      this.$emit('clearAllTodo')
    }
   },
}
</script>

<style>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>